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A052408
as a simple table
n
a(n)
1
0
2
0
3
0
4
1
5
1
6
3
7
6
8
20
9
48
10
164
11
551
12
2176
13
9985
14
46969
15
253285
16
1388694
17
8053363
18
48266380
19
294130212
[0,0,0,1,1,3,6,20,48,164,551,2176,9985,46969, 253285,1388694,8053363,48266380,294130212]